You create a Microsoft ASP.NET application by using the Microsoft .NET Framework version 3.5. 
You create a page that contains the following code fragment. 

You write the following code segment in the code-behind file for the page. 
Private Sub BindData（ByVal sender As Object， _ByVal e As EventArgs） 
lstLanguages.DataSource = _ 
CultureInfo.GetCultures（CultureTypes.AllCultures） 
lstLanguages.DataTextField = "EnglishName" 
lstLanguages.DataBind（） 
End Sub 
You need to ensure that the lstLanguages ListBox control maintains the selection of the user during postback. 
| English | Chinese | Japan | Korean | - 93 - Test Information Co.， Ltd. All rights reserved. Which line of code should you insert in the constructor of the page？

单项选择题You create a Microsoft ASP.NET application by using the Microsoft .NET Framework version 3.5.  You create a page that contains the following code fragment.  | English | Chinese | Japan | Korean | - 92 - Test Information Co.， Ltd. All rights reserved. <asp：ListBox ID= lstLanguages AutoPostBack= true  runat= server   >  You write the following code segment in the code-behind file for the page.  void BindData（object sender， EventArgs e） {  lstLanguages.DataSource =  CultureInfo.GetCultures（CultureTypes.AllCultures）；  lstLanguages.DataTextField =  EnglishName ；  lstLanguages.DataBind（）；  }  You need to ensure that the lstLanguages ListBox control maintains the selection of the user during postback.  Which line of code should you insert in the constructor of the page？（）

A.this.Init += new EventHandler(BindData); 
B.this.PreRender += new EventHandler(BindData); 
C.lstLanguages.PreRender += new EventHandler(BindData); 
D.lstLanguages.SelectedIndexChanged += new EventHandler(BindData); 

单项选择题You create a Microsoft ASP.NET application by using the Microsoft .NET Framework version 3.5.  You create a page that contains the following control.   You write the following code segment in the code-behind file for the page.  Private Sub LoadDate（ByVal sender As Object， _ByVal e As EventArgs）  If IsPostBack Then  calBegin.SelectedDate = _  DirectCast（ViewState（ date ）， DateTime） End If  End Sub  Private Sub SaveDate（ByVal sender As Object， _ByVal e As EventArgs）  ViewState（ date ） = calBegin.SelectedDate  End Sub  You need to ensure that the calBegin Calendar control maintains the selected date. Which code segment should you insert in the constructor of the page？ （）

A.A
B.B
C.C
D.D

单项选择题You create a Microsoft ASP.NET application by using the Microsoft .NET Framework version 3.5.  You create a page that contains the following control.   You write the following code segment in the code-behind file for the page. void LoadDate（object sender， EventArgs e） { if （IsPostBack） {  calBegin.SelectedDate =  （DateTime）ViewState[ date ]；  }  }  void SaveDate（object sender， EventArgs e） {  ViewState[ date ] = calBegin.SelectedDate；  }  You need to ensure that the calBegin Calendar control maintains the selected date. Which code segment should you insert in the constructor of the page？（）

A.A
B.B
C.C
D.D

单项选择题You create a Microsoft ASP.NET application by using the Microsoft .NET Framework version 3.5.  You create a Web page that has a GridView control named GridView1. The GridView1 control displays the  data from a database named Region and a table named Location.  You write the following code segment to populate the GridView1 control. （Line numbers are included for reference only.）  01 Protected Sub Page_Load（ByVal sender As Object， _ ByVal e As EventArgs）  02 Dim connstr As String  03 ...  04 SqlDependency.Start（connstr）  05 Using connection As New SqlConnection（connstr）  06 Dim sqlcmd As New SqlCommand（）  07 Dim expires As DateTime = DateTime.Now.AddMinutes（30）  08 Dim dependency As SqlCacheDependency = _  09 New SqlCacheDependency（ Region ，  Location ）  10 Response.Cache.SetExpires（expires）  11 Response.Cache.SetValidUntilExpires（True）  12 Response.AddCacheDependency（dependency）  13  14 sqlcmd.Connection = connection  15 GridView1.DataSource = sqlcmd.ExecuteReader（）  16 GridView1.DataBind（）  17 End Using 18 End Sub  You need to ensure that the proxy servers can cache the content of the GridView1 control. Which code segment should you insert at line 13？ （） | English | Chinese | Japan | Korean | - 90 - Test Information Co.， Ltd. All rights reserved.

A.Response.Cache.SetCacheability(HttpCacheability.Private) 
B.Response.Cache.SetCacheability(HttpCacheability.Public) 
C.Response.Cache.SetCacheability(HttpCacheability.Server) 
D.Response.Cache.SetCacheability(HttpCacheability.ServerAndPrivate) 

单项选择题You create a Microsoft ASP.NET application by using the Microsoft .NET Framework version 3.5.  You create a Web page that has a GridView control named GridView1. The GridView1 control displays the  | English | Chinese | Japan | Korean | - 88 - Test Information Co.， Ltd. All rights reserved. data from a database named Region and a table named Location.  You write the following code segment to populate the GridView1 control. （Line numbers are included for reference only.）  01 protected void Page_Load（object sender， EventArgs e）  02 {  03 string connstr；  04  05 SqlDependency.Start（connstr）；  06 using （SqlConnection connection =  07 new SqlConnection（connstr））  08 {  09 SqlCommand sqlcmd = new SqlCommand（）；  10 DateTime expires = DateTime.Now.AddMinutes（30）；  11 SqlCacheDependency dependency = new 12 SqlCacheDependency（ Region ，  Location ）；  13 Response.Cache.SetExpires（expires）；  14 Response.Cache.SetValidUntilExpires（true）；  15 Response.AddCacheDependency（dependency）；  16  17 sqlcmd.Connection = connection；  18 GridView1.DataSource = sqlcmd.ExecuteReader（）；  19 GridView1.DataBind（）；  20 } 21 }  You need to ensure that the proxy servers can cache the content of the GridView1 control. Which code segment should you insert at line 16？（）

A.A
B.B
C.C
D.D